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Re: locating and replacing oxygen sensor
Is the check engine light on with oxygen sensor codes?
If there are no problems with it leave it alone. i have seen factory sensors working good with over 300k miles on them. I recommend using dealer tune parts. at least NGK plugs. I have found misfire problems with aftermarket tune parts on several occasions.
there could be 2 oxygen sensors and they will be in the exhaustmanifold or the catalytic converter or the "A" pipe between the manifold and catalytic converter. if you have the correct tools you can do it. sometimes requires special tools and rarely they are seized in the exhaust manifold and damage the manifold than it has to be replaced.
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The Heated Oxygen Sensor (2) located rear of catalytic converter produces an
output signal relative to oxygen storage capacity of catalytic converter. Ho2S
2 signal is less active than signal produced by front oxygen sensor. This code
sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes
(time depends on model. Could be as high as 4 minutes)
There may be no noticeable symptoms except for MIL illumination. Possible high
fuel pressure can over rich the system.
A code P0138 may mean that one or more of the following has happened:
Faulty O2 sensor
Short to battery voltage in O2 sensor signal circuit
High fuel pressure (not as likely)
Here are some potential solutions:
Replace O2 sensor
Repair short to battery voltage in o2 sensor signal circuit
before you do anything, let the engine and exhaust line cool down first. disconnet the electrical connector to the sensor, spray some lubricating fluid like " WD 40 " to the thread of the sensor, allow for a few minute then use the right spanner to turn the sensor. here you go, the sensor is now removed. Installing a new sensor is just the reverse. Enjoy it.
Stop by your local auto parts store and ask how many oxygen sensors the Honda Civic has installed. They are usually installed on the exhaust pipe before the catalytic convertor, and screw off with an open-end wrench. The heat causes the sensor to be a bit difficult to remove, and you will need to put some anti-seize compound on the threads of the new sensors. Most cars have 2 or 3 oxygen sensors.
Your local AutoZone can also put the diagnostic computer on you car which should indicate whether its actually a bad oxygen sensor, or they will read the error codes to tell you what the problem really is. Best of all, it's FREE.
I had the same problem. After going through everything, it ended up being the distibutor cap. The tips were really bad. While I was in there, I replaced the rotor too. Try that. Hopefully this works for you!